The Walter 01H027 27\/64″ SST Stub Drill is an engineered solution designed to overcome the common failure modes associated with standard length drill bits in industrial environments. Known technically as screw machine length drills, these stub bits offer a significantly shorter flute and overall length compared to standard jobber bits. This reduction in length translates directly to increased torsional rigidity. In MRO and fabrication settings, rigidity is paramount when drilling through tough alloys like stainless steel or when working with hand-held power tools where off-axis pressure can easily snap a longer bit.<\/p>\n
This specific drill features Walter\u2019s proprietary bronze SST surface treatment. This treatment is not merely cosmetic; it serves a functional purpose by reducing the coefficient of friction between the tool and the workpiece. Lower friction means less heat generation, which is the primary enemy of cutting tool life, especially in work-hardening materials like austenitic stainless steel. The bit is ground with a 135\u00b0 split point geometry. Unlike standard 118\u00b0 chisel points that require significant thrust to start cutting and often wander (walk) on the surface, the 135\u00b0 split point begins cutting immediately upon contact. This self-centering action eliminates the mandatory need for center punching, streamlining the workflow in high-volume sheet metal operations.<\/p>\n
The 01H027 is particularly effective for drilling thin-walled materials and sheet metal. The shorter flute length minimizes the “corkscrewing” effect often seen when a drill breaks through the backside of thin material. Furthermore, the robust web construction allows operators to apply higher feed rates without compromising the structural integrity of the bit. Whether utilized in a stationary drill press for precision work or a portable hand drill for on-site repairs, this tool delivers consistent hole quality and exceptional durability.<\/p>\n
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